diff options
Diffstat (limited to 'linux/drivers/media/video/bttv-risc.c')
| -rw-r--r-- | linux/drivers/media/video/bttv-risc.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/linux/drivers/media/video/bttv-risc.c b/linux/drivers/media/video/bttv-risc.c index acceee39a..4efe74dd8 100644 --- a/linux/drivers/media/video/bttv-risc.c +++ b/linux/drivers/media/video/bttv-risc.c @@ -52,8 +52,10 @@ bttv_risc_packed(struct bttv *btv, struct btcx_riscmem *risc, int rc; /* estimate risc mem: worst case is one write per page border + - one write per scan line + sync + jump (all 2 dwords) */ - instructions = (bpl * lines) / PAGE_SIZE + lines; + one write per scan line + sync + jump (all 2 dwords). padding + can cause next bpl to start close to a page border. First DMA + region may be smaller than PAGE_SIZE */ + instructions = 1 + ((bpl + padding) * lines) / PAGE_SIZE + lines; instructions += 2; if ((rc = btcx_riscmem_alloc(btv->c.pci,risc,instructions*8)) < 0) return rc; @@ -105,7 +107,7 @@ bttv_risc_packed(struct bttv *btv, struct btcx_riscmem *risc, /* save pointer to jmp instruction address */ risc->jmp = rp; - BUG_ON((risc->jmp - risc->cpu + 2) / 4 > risc->size); + BUG_ON((risc->jmp - risc->cpu + 2) * sizeof(*risc->cpu) > risc->size); return 0; } @@ -223,7 +225,7 @@ bttv_risc_planar(struct bttv *btv, struct btcx_riscmem *risc, /* save pointer to jmp instruction address */ risc->jmp = rp; - BUG_ON((risc->jmp - risc->cpu + 2) / 4 > risc->size); + BUG_ON((risc->jmp - risc->cpu + 2) * sizeof(*risc->cpu) > risc->size); return 0; } @@ -308,7 +310,7 @@ bttv_risc_overlay(struct bttv *btv, struct btcx_riscmem *risc, /* save pointer to jmp instruction address */ risc->jmp = rp; - BUG_ON((risc->jmp - risc->cpu + 2) / 4 > risc->size); + BUG_ON((risc->jmp - risc->cpu + 2) * sizeof(*risc->cpu) > risc->size); kfree(skips); return 0; } |